Mechanical Design 2 min
How Metal Breaks Without Being Overloaded (Fatigue Explained)
A part can carry a load a million times and then break under a load it carried a million times before. Metal fatigue starts at a microscopic crack that grows a little every cycle until what is left can't hold.
The video shows crack initiation at a notch, the beach marks of growth, the final fracture, and the S–N curve engineers use to design for it.
In this video
- Why cyclic loads break parts that static loads don't
- Crack initiation, growth and final fracture
- Stress concentration at notches and holes
- The S–N curve and the fatigue limit